Catch problems with ParameterFilters in REST Layer configuration before they can be saved.
Added accessors for ParameterFilter subclasses
Support for context specific XMLConfigurationProvider
Allow for new subtypes of ParameterFilter
Clarified and enforced use of null values in ParameterFilters
Initializing default parameter filter value to empty string
Clarified javadoc for XML serialization contexts
Unit tests for contextual XML Config